Please don't feel bad. This kind of thing is rampant with puppy mills and backyard breeders of pure bred dogs. The small breed dogs are all the rage right now so they seem to be every where.
If you want a good healthy dog contact your local dog clubs to find a breeder they recommend.
Here is a link to the AKC LA page of clubs:
American Kennel Club - Club Search and Directory
The clubs usually have a breeder referral contact person. Some have email addresses and some you have to write to. Take your time and check out everything. A dog should be part of your family for many years. You don't want to move too quickly when you are selecting a family member.